http://www.theverge.com/2015/7/6/8899807/instagram-1080p-pictures-photo-upload
The Verge recently made known the latest app versions of Instagram are uploading photo
I noticed that simply removing the size part, the biggest image is returned:
https://scontent.cdninstagram.com/hphotos-xfa1/t51.2885-15/s640x640/e35/sh0.08/11370971_837216559694773_771634899_n.jpg
to
https://scontent.cdninstagram.com/hphotos-xfa1/t51.2885-15/e35/sh0.08/11370971_837216559694773_771634899_n.jpg
Hence this should do the trick:
var hightUrl = data.images.standard_resolution.url.replace("/s640x640/","/");